Abstract: Tungsten steel is widely used across various fields due to its excellent properties. However, its high hardness and difficult machinability result in poor surface quality of the workpieces. To address this issue, experiments were conducted on tungsten steel using nanofluid minimum quantity lubrication grinding. Tungsten steel grinding tests were carried out under three different conditions, namely graphene nanofluid minimum quantity lubrication, flood lubrication, and dry grinding. A novel experimental approach utilizing a combination of regular polygon grinding trajectories was proposed. The effects of grinding speed, feed rate, and grinding depth on grinding force and workpiece surface quality were compared. It is found that under the same grinding parameters, the grinding force under nanofluid minimum quantity lubrication is the smallest, the pouring type is the second, and the dry type is the largest. At the grinding speed v=15 m/s, the normal grinding force F_n under the condition of nanofluid minimum quantity lubrication is reduced by about 25.13% and 4.52%, respectively, and the tangential grinding force F_t is reduced by about 28.97% and 9.92%, respectively, compared with dry and pouring. Graphene nanofluid minimum quantity lubrication has a significant effect on improving tungsten steel grinding.